<?php if (!$blog_post->getCommentsCount()) : ?>
  <?php echo __('No comment') ?>
<?php else: ?>
<?php echo link_to(format_number_choice(
  '[1]1 comment|(1,+Inf]%1% comments', array('%1%' => $blog_post->getCommentsCount()), $blog_post->getCommentsCount()), 
  'blog_comment', array('filters[post_id]' => $blog_post->getId())) ?>
<?php endif ?>